GCJBP Laennec Injection contains a variety of cytokines derived from human placenta, amino acids, peptides, nucleobases, and carbohydrates. This product is approved for improving liver function. Also, it has been prescribed for lots of diseases such as menopausal disorders, atopic dermatitis, skin cares as well as fatigue for long time. Although its action mechanism and clinical effectiveness are not still clear, there are reports which say a strong probability of its clinical effectiveness in the chronic fatigue patients.